Re: Use arbitrary notes (with stem/flag) as MMR stencil override

[David Nalesnik]

Off the top of my head--

On Tue, Feb 5, 2019 at 9:51 AM Kieren MacMillan
<address@hidden> wrote:
>
> Hi Urs,
>
> > I'd think that MMRs are generally the only items that are printed in the 
> > middle of a measure.
>
> No: MMRs [essentially always], measure numbers [often], final single-note 
> columns [in many engravings], boxed markup/instructions inside the staff [in 
> modern music], over-staff markups ["Safety", fermata, etc.].
>
> I’m sure there are more — that list was just off the top of my head.
>
> > Probably one would have to see how the MultiMeasureRest originally performs 
> > its centering and learn from that (but I'd expect this to be in the C++ 
> > part).
>
> Yes, this is kind of what I’m hinting towards: I’m wondering if, in the C++ 
> part, an interface could be added which centres a given grob in the middle of 
> the current measure. (I assume the implementation would then have to be 
> "retrofitted" onto MMRs to duplicate the current behaviour.)
>

Centering a MultiMeasureRest in the measure is an issue of
"springs-and-rods".  Centering text or whatever outside the staff
through a spanner mechanism (see MeasureCounter) is done is relation
to NonMusicalPaperColumns which organize bar lines and "prefatory"
material.   This is the reason I coopted MeasureCounter for my hack.
Also, with a bit more refinement, this is what I did for my
MeasureAttachedSpanner, which I see I need to put up for patch review
as soon as I can, as I keep bringing it up :)

David N.